Earlier this month, a group of Japanese officials came to Glendale, Calif., with an unusual demand: They wanted the city to take down a public monument in the park next to its public library. The bronze statue of a girl in traditional South Korean dress seated next to an empty chair is a memorial to the 70,000 to 200,000 Korean, Filipina, Chinese, Taiwanese, Indonesian and Dutch “comfort women” — a euphemism for sex slaves — conscripted into Japanese military brothels during World War II.